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Effects of Low Pressure EGR on Transient Air System Performance and Emissions for Low Temperature Diesel Combustion
Technical Paper
2011-24-0062
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Low pressure EGR offers greater effectiveness and flexibility
for turbocharging and improved heat transfer compared to high
pressure EGR systems. These characteristics have been shown to
provide potential for further NOx, soot, and fuel
consumption reductions in modern diesel engines. One of the
drawbacks is reduced transient response capability due to the long
EGR path. This can be largely mitigated by combining low pressure
and high pressure loops in a hybrid EGR system, but the changes in
transient response must be considered in the design of an effective
control strategy.
The effect of low pressure EGR on transient emissions was
evaluated using two different combustion strategies over a variety
of transient events. Low pressure EGR was found to significantly
lengthen the response time of intake oxygen concentration following
a transient event, which can have a substantial effect on emissions
formation. The difference in response time between the two EGR
systems has important implications for prediction of transient
emissions based on steady state mode points since the correlation
between transient and steady state emissions may change
substantially when low pressure EGR is implemented. NO emissions
were found to be the most sensitive to intake oxygen concentration
settling time, particularly for the kinetically controlled early
injection combustion mode, resulting in large increases in
transient emissions relative to steady state levels.
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Citation
Heuwetter, D., Glewen, W., Meyer, C., Foster, D. et al., "Effects of Low Pressure EGR on Transient Air System Performance and Emissions for Low Temperature Diesel Combustion," SAE Technical Paper 2011-24-0062, 2011, https://doi.org/10.4271/2011-24-0062.Also In
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